Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c4cda56c29cd6b…

MALICIOUS

PDF

34.3 KB Created: 2021-06-18 19:33:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a3d68ca2740d6b5e17f46909a022302e SHA-1: 31062b869817cd944c572654f4ee77a1c72c95e9 SHA-256: 63c4cda56c29cd6bcf8f64d2291f488b53cc1b987e7d57d1a261b34456eb3879
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising free game hacks and currency. The document body and embedded URLs suggest a lure for users seeking in-game advantages, which is a common social engineering tactic. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.co/app/431946152/get-roblox-app-for-free-game-hack In PDF document text
    • http://rightlead.com.tw/image/data/files/join-this-group-for-free-robux_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/jump-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/does-roblox-have-free-sneaks_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/download-roblox-windows-10-free_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/cbro-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/policesim-hack-roblox_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/rbxfree-com-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/how-to-get-free-admin-in-your-own-roblox-place_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31EF 21768 bytes
SHA-256: a0e20101e23dccf3f5340796d09b840005c01666980b79afccd993d5941ac3ac
font_01_sfnt_off000061dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61DC 18744 bytes
SHA-256: 8130fef1edb301bdd9aa4e7c7081b29200ea708241f9dd21e03aaaa5da8b2d17

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